Im having difficulties playing bars with my index finger, i lay it across a whole fret and push down as hard as i can and use my thumb full force and still nothing, the first three strings sound good, but the last three are all muted and sound like garbage, any pointers from the pros of UG?
Make sure your index finger is pressed down hard enough to the fretboard. (and your other fingers as well) It might take a while to get the muscles in your hand to be able to do this for long periods before it starts to hurt so just keep practicing.
Practice... try playing each note individually while keeping your finger across of all six strings
They're just difficult for a while. Keep practising making sure all strings ring out clearly
That's how it started for me. It just takes practice.
to sum it all up... practice
Read one of the other several bar chord topics in this section, right on this same page.